JP4422503B2 - Magnetic region manufacturing apparatus and manufacturing method - Google Patents

Description

  The present invention relates to a magnetic region manufacturing apparatus and manufacturing method, and more particularly to a magnetic region manufacturing apparatus and manufacturing method capable of narrowing a magnetic region formed in a non-magnetic material.

As a method for forming a magnetic region with a predetermined pitch in a non-magnetic material, there is a magnetic scale manufacturing method that has already been proposed by the present applicant (see Patent Document 1). In this method, the austenitic steel containing a martensite structure is heat treated to be demagnetized, and then, against the austenitic steel, a pressing tool is pressed at a predetermined interval from the surface side, and the pressing portion is plastically deformed. Precipitation of the martensite structure due to the processing-induced transformation occurs in the pressed part, and this part becomes a magnetic region, and the magnetic region is formed at a predetermined pitch. According to this method, a material in which magnetic regions and nonmagnetic regions are alternately arranged can be manufactured in a short time with simple equipment as compared with other conventional methods such as a laser method and a short peening method.
JP 2001-27550 A

  However, in the conventional method of Patent Document 1, the pitch of the magnetic region can be narrowed to about 2.0 mm at most, and the pitch is narrowed by recent miniaturization and high accuracy of various machines. There is an inconvenience that it is not possible to respond to the request for conversion. Specifically, in HA (home automation) equipment such as moving kitchens, moving toilet seats, and moving curtains that automatically adjust the position, along with the development of linear scale type linear motion actuators applied to the equipment. Therefore, it is necessary to reduce the size and accuracy of the piston rod in the position detection mechanism, and it is desired to reduce the pitch of the magnetic regions formed on the piston rod.

By the way, in the conventional method of Patent Document 1, the processing-induced transformation region expands not only in the pressing direction (depth direction) of the material but also around the pressing portion when pressed by the pressing tool, and the pitch of the magnetic region is reduced. There was a certain limit to narrowing down.
Therefore, as a result of earnest research, the present inventors have stepwise used two types of pressing tools having different areas of the pressing surface to the material, thereby processing-induced transformation around the pressing portion. It was found that the expansion of the area can be suppressed. That is, after pressing a predetermined part of the material with the first pressing tool having a large area of the pressing surface and plastically deforming, the second pressing tool having a small area of the pressing surface is pressed against the part. When plastic deformation is performed, expansion of the work-induced transformation region around the pressed part is suppressed and the martensite volume ratio is locally compared to the case where plastic deformation with the same amount in the depth direction is performed with one type of pressing tool. Was found to rise. As a result, the pitch of the magnetic region can be reduced to about 1/10 of the conventional method, and high accuracy of a magnetic scale or the like can be expected.

  The present invention is based on the inventor's knowledge paying attention to the above-mentioned disadvantages. The purpose of the present invention is to form a magnetic region in a short time with simple equipment when forming a magnetic region in a non-magnetic material. Another object of the present invention is to provide a magnetic region manufacturing apparatus and a manufacturing method capable of reducing the size of the magnetic region.

In order to achieve the above object, the present invention is an apparatus for plastically deforming a predetermined portion of a material made of non-magnetized austenitic stainless steel by pressing, and forming a magnetic region by processing-induced transformation in the predetermined portion. Because
A pressing unit that presses the predetermined part; and a moving unit that moves the pressing unit;
The pressing means includes first and second pressing tools each including a curved pressing surface, and the second pressing tool is set so that the area of the pressing surface is smaller than that of the first pressing tool. And the structure of moving so that the site | part pressed with the said 1st pressing tool may be pressed again is taken.

In addition, the present invention heat treats a material made of austenitic stainless steel to make it non-magnetic, and then presses and plastically deforms a predetermined part of the material, thereby forming a magnetic region by processing-induced transformation in the predetermined part. In the way to
A second pressing unit having a curved pressing surface having an area smaller than that of the first pressing tool after the predetermined portion is pressed and plastically deformed by a first pressing tool having a curved pressing surface. With this pressing tool, the predetermined region is pressed again and plastically deformed to form a magnetic region in the predetermined region.

  In this specification, “curved surface shape” is used as a concept including not only a shape recognized by the naked eye as a curved surface but also a shape that cannot be visually recognized by the naked eye but microscopically recognized as a curved surface.

  According to the present invention, a magnetic region can be formed by simply plastically deforming a predetermined portion of a non-magnetized austenitic stainless steel used as a material such as a magnetic scale. Compared to conventional methods such as the peening method, a magnetic region can be formed in a non-magnetic material in a short time with simple equipment. In addition, after the predetermined portion of the stainless steel is pressed and plastically deformed by the first pressing tool having a large pressing surface area, the second pressing tool having a small pressing surface area is pressed against the portion. Since the plastic deformation is performed, the expansion of the work-induced transformation region around the pressing direction is suppressed, and the magnetic region can be narrowed.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a conceptual diagram of a magnetic region manufacturing apparatus according to the present embodiment. This manufacturing apparatus 10 makes the material 11 made of austenitic stainless steel non-magnetic by heat treatment or the like, then plastically deforms a predetermined portion of the surface of the material 11, and precipitates a martensite structure by processing-induced transformation. An apparatus for magnetizing the predetermined portion.

  Specifically, the manufacturing apparatus 10 includes a holding unit 13 that detachably holds a round bar-shaped material 11 to be processed, and a rotational drive such as a motor that rotates the holding unit 13 so that the material 11 rotates about an axis. Means 14, a pressing means 16 disposed on the outer peripheral surface side of the material 11 held by the holding means 13 and pressing the outer peripheral surface, and a moving means 17 for moving the pressing means 16 in the vertical and horizontal directions in FIG. And is configured.

  The holding means 13 employs a known chuck structure that is used for holding a work material on a lathe or the like. As the holding means 13, other known structures can be adopted as long as the material 11 can be detachably held.

  The pressing means 16 includes first and second pressing tools 19 and 20 that press the outer peripheral surface of the material 11, and a support 22 that detachably supports the first and second pressing tools 19 and 20. It is configured with.

  As shown in FIG. 2, the first and second pressing tools 19 and 20 are formed in a slightly sharp curved surface at the tip portion, and the tip portion is a pressing surface 19 </ b> A and 20 </ b> A against the material 11. It becomes. Here, the pressing surface 20 </ b> A of the second pressing tool 20 is set to have a smaller area than the pressing surface 19 </ b> A of the first pressing tool 19. The sizes of the pressing tools 19 and 20 are appropriately determined depending on the width of the magnetic region 24 (see FIG. 1) formed on the material 11, and the overall shape of the pressing tools 19 and 20 is the pressing surfaces 19A and 20A. If it is as above-mentioned, various shapes, such as various weight shape and various column shapes, can be employ | adopted as a shape behind the said press surface 19A, 20A.

  The support 22 supports the pressing tools 19 and 20 in parallel along the left-right direction in FIG. 1 so that the pressing surfaces 19A and 20A face the outer peripheral surface of the material 11. In particular, the first pressing tool 19 is supported on the right side in FIG. 1, while the second pressing tool 20 is supported on the left side in FIG. Further, the pressing tools 19 and 20 are supported so that the pressing surfaces 19A and 20A are in the same position in the vertical direction in FIG.

  The moving means 17 is provided so as to be able to move the support 22 in the perpendicular biaxial direction in the vertical direction and the horizontal direction in FIG. 1 using a known feed screw shaft structure. These biaxial movements may be performed automatically using a motor or the like, or may be performed manually by operating a handle or the like.

  Next, a method for manufacturing a magnetic region using the manufacturing apparatus 10 will be described.

  Austenitic stainless steel is machined in advance to form a round bar-shaped material 11. Here, as an austenitic stainless steel, what contains a martensitic structure 10% or more by volume ratio is preferable. Next, the material 11 is heated to around 1000 ° C. and subjected to a solution heat treatment, thereby demagnetizing the material 11. Note that the heat treatment is preferably performed in a vacuum. The solution heat treatment may be performed on the entire material 11 or may be performed on a part of the surface side of the material 11.

  Next, the heat-treated material 11 is set on the holding means 13 of the manufacturing apparatus 10, and the pressing means 16 is disposed near the holding means 13. Then, using the moving means 17, the support 22 is moved so that the pressing surfaces 19 </ b> A and 20 </ b> A of the pressing tools 19 and 20 come into contact with and press against the outer peripheral surface of the material 11. Before and after this, the rotation driving means 14 is driven to rotate the material 11 around the axis. Thereafter, the support 22 is moved rightward in FIG. 1 using the moving means 17 while the pressing surfaces 19A and 20A are in contact with the outer peripheral surface of the material 11. Accordingly, the material 11 is partially pressed by the first and second pressing tools 19 and 20. Note that the pressing force of the pressing tools 19 and 20 against the material 11 is set to an extent that causes plastic deformation of the material 11 at least, and is appropriately selected according to the type of the material 11. That is, here, with the movement of the support 22, the first pressing tool 19 precedes the second pressing tool 20 and moves on the outer peripheral surface of the rotating material 11 toward the right side in FIG. 1. A helical plastic deformation site is formed on the outer peripheral surface. Here, the second pressing tool 20 moves while pushing behind the locus of the plastic deformation portion formed by the first pressing tool 19, and realizes such movement. As described above, the separation width of the pressing tools 19 and 20, the diameter and rotation speed of the material 11, and the feed speed of the moving means 17 are set. That is, the part of the material 11 that is plastically deformed by the pressing by the first pressing tool 19 is pressed so as to be traced by the second pressing tool 20 having a pressing surface 20A smaller than that of the first pressing tool 19, and the part is pressed. Further plastic deformation is brought about and a helical magnetic region 24 is formed.

  Therefore, according to such an embodiment, by applying a pressing force from a different direction to the part that has been pressed once, the processing-induced transformation is induced in a spot manner, and the processing-induced transformation region is diffused around the pressing portion. It is possible to prevent and increase the martensite volume ratio with respect to the pressed portion. As a result, the pitch of the magnetic regions 24 can be reduced.

  Note that the manufacturing apparatus 10 according to the present invention is not limited to the above-described embodiment, and the first pressing tool 19 presses a predetermined portion of the material 11 to plastically deform it, and then the first pressing against the predetermined portion. As long as the second pressing tool 20 having the pressing surface 20A having a smaller area than the tool 19 can be pressed and plastically deformed, various configurations can be adopted.

  For example, as shown in FIG. 3, as the moving means 17, the support 22 that supports the first and second pressing tools 19, 20 can be moved in three orthogonal directions on the surface of the flat material 11. The surface of the material 11 is pressed by each pressing tool 19, 20 while moving the second pressing tool 20 following the first pressing tool 19, The magnetic region 24 may be formed by plastic deformation.

  In addition, the configuration of each part of the apparatus in the present invention is not limited to the illustrated configuration example, and various modifications are possible as long as substantially the same operation is achieved.

  The manufacturing apparatus 10 and the manufacturing method described above can be applied to the formation of magnetic parts necessary for magnetic scales, precision machine parts, and the like.

The conceptual diagram of the manufacturing apparatus of the magnetic area | region which concerns on a present Example. (A) is sectional drawing which expanded and represented the front-end | tip vicinity of the 1st press tool, (B) is sectional drawing which expanded and represented the front-end | tip vicinity of the 2nd press tool. The conceptual diagram of the manufacturing apparatus of the magnetic area | region which concerns on a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Magnetic region manufacturing apparatus 11 Material 16 Pressing means 17 Moving means 19 First pressing tool 19A Pressing surface 20 Second pressing tool 20A Pressing surface 24 Magnetic region

Claims (2)

A device that plastically deforms a predetermined part of a material made of non-magnetized austenitic stainless steel by pressing, and forms a magnetic region by processing-induced transformation in the predetermined part,
A pressing means for pressing the predetermined part; and a moving means for moving the pressing means;
The pressing means includes first and second pressing tools each including a curved pressing surface, and the second pressing tool is set so that the area of the pressing surface is smaller than that of the first pressing tool. The apparatus for manufacturing a magnetic region is characterized in that it moves so as to press the part pressed by the first pressing tool again. In the method of forming a magnetic region by processing-induced transformation in the predetermined part after pressing the predetermined part of the raw material and plastically deforming it after heat-treating the material made of austenitic stainless steel,
A second pressing member having a curved pressing surface having an area smaller than that of the first pressing tool after the predetermined portion is pressed and plastically deformed by a first pressing tool having a curved pressing surface. A method of manufacturing a magnetic region, wherein the magnetic region is formed in the predetermined portion by pressing the predetermined portion again with a pressing tool to cause plastic deformation.

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